Security Exception in BE 1.4.5 (fresh deployment)

I was waiting for 1.4.5 coz of a security exception I was getting in 1.4 when I tried hosting at my webhost.
Finally when 1.4.5 came in...I notice some weird behaviour. Occassionally I get this error :

Server Error in '/' Application.

Security Exception

Description:
The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.

In any case there is more than on way to skin a cat. Do they allow you to call XmlDocument.Load()? How about opening a socket or tcpclient? can you use createobject for winhttp or an xml web request?...

I have installed the latest version as well. (1.4.5)
I will try and see if I can ask the hosting providers to elevate my app to medium trust. Is there any other way I can work around the security exception?